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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcf0dacb1e047123912748d33ad6a0cc395ee1003313e44153cab3dc87625bbd' 
  AND token = 'g5wz4mJXH1Gt0/mK8cDytPuWR9BWxmKUFsW8kJNu5pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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