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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25675f7ac0c27978a7a09ecc2bfe5be655b289ab0c4eec41b9ea3d7b3e08a2df' 
  AND token = 'MYr3N+LPQJvULe6it+0Iop8AsRO+QhUGBnIQBXgIguo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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