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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fcea108b61d417cfca3f5b6afd88b2034ccedbc9de85304e377579227a574c3' 
  AND token = 'r1eelcupQ4ttT8CKTl+ZanVPx7Cu2GEMnX9vKWZXyTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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