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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b69446b48723b58a1d9f700d8d93070e049cb39137db832f92b4735fe053aee5' 
  AND token = '3RsD38CaroGIGmHincsY+Lt7p5Yef7c5asma744ikG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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