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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd68a978530f414490edecf23bedf81225b4d854ffe4bbb72b14b3a2f03a5bc46' 
  AND token = 'Ki1IkF8ZoTFCMD2Dk52DwhSu+Xnn3/ZVtZVTI2lb94g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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