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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee526c483eb90f3094986d8ba95415b49fd05b35cc2c6ad5ea5a7aebab60308d' 
  AND token = 'OZveWuZXD+ffnAbvRxonOgRudOMYg82TljaOONFEC9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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