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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4ed1f230fac205aa942f510a15649329cfd7b345806383c26ceda5ef0cff63e' 
  AND token = '/vZHgrdH4LYN4FvBmhsdU59/ZxgT3Z6UyE0QypUpQ/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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