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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0fe0f4ba5e7c397d953c783e6fded6f10adf52fc2175f25340079d05002d1ba' 
  AND token = 'G484xCeGQR01QUPDQ0ZjUOFoAwmhriPG78/dHNHHrp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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