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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '103c26f0bb26a731dcedeee058b739f29a7179f1e1b96052145e0ac137ca7e5e' 
  AND token = '0fZG1j/dT/LeBWRbxoz+wcd7k3jKKn2gdR2xpkRK6+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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