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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0584e6cd5dfd101a4909370df57eb2288d791a84c2102b89a83d96cebe118360' 
  AND token = 'zpgOW+1RXra3tAchE3g125fQ2axrFTzD7xK6Z131IfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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