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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dc7f8e10163c17642e8aa7b5d043227b341ce2064a158cd04db81ef2aa4fe08' 
  AND token = 'PDSKAJ6oB8gH1VPvWi9HVYS1juR26x0Qhl6deoEF54M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}