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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b36c1a4d53b07594d60e5478711fe8950095106602965490ecc2b9f5a1ddfd3a' 
  AND token = '+CpxPNHc9y1O+r88U+nnmGd0IBDwtCqlYFKOxQF1g2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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