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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fd11f88b640eea1b8854851bd32e82d85f9b9eac669d1f1cf72843b9fe85708' 
  AND token = '4UMuic0tKnyl01cAASLxrB1g7LizWdBeyKc/rRJRQH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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