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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e354af1f4c30be334afbe928b0b24383b9a95c10dcf790f703b2b918d69a60ed' 
  AND token = 'YF2R7tYTgEKOnMvOmzwmr6yOuES+31bom7KHY7GWe1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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