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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bafdc43b04edf5b5271d727a707b15053129a261e55d4404384ec1371778a5c1' 
  AND token = '2UCEoBBQd4SQva6HI/Bp6FZlrwIfyeTAEQo78hP0vaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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