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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89cc85380ec15963f01ee378278f9c36fbb309be273a8145bc4d165e5a5f0efc' 
  AND token = 'Luesv6J9SxEbsZWQp6iM0w03/9cwd/qE+2/vAzq9ZKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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