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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '903e910b6b3134969ec4cfe41ee8c11884aa9d7bb641e5d322274effea79dcf9' 
  AND token = '1REXLB4BXxAJuTqbPS78Jh96xfmsqlaQSZGxGJMw3B4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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