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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1edfab9f2360440a40e6db028c09082ede8a6e34ed26b409e0f57d9275a2173a' 
  AND token = '4HDv0Wl1N22eVrNeFq2hguF45HcUmOOmRZQdLZ0OEjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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