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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26cb906e474dcac2f409b6e12158707bc2e0d8690d77389ed4a1528e28c5eb85' 
  AND token = 'XOcKffgc0a8YPdO6ysdos5u/bl9TiRQ9h3YcxL0C6PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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