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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96a4860c6420e7ea5eb6448c2c8a600d68c3dbdf796edd4e08c0bab2c5f83631' 
  AND token = 'P5aH2Sel+beaixrEz10af4EkTYvRmsV5AJuR81+dcjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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