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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b03458fe5f59009424b27674a2849c15dc94f50aa3a20db5f1760570aab67ea6' 
  AND token = 'nbcgeWM7swMTCaxSJj2iM5xdd27G6DaYQ9IoOhhiYXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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