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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cb90683f12f6020f76891a6b22f688a75652b68bf5b876414bad9df21ce6ad5' 
  AND token = '0TQ1w4qR8grgAU8hP6faF9zgej4tcUQAwD4Gz93iNdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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