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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bec64fa05db67e160a6adeaf0b591176e86ffdc2140609bf4e688b7ecd3b9107' 
  AND token = '99LcMV4lDVhlnYCd9+q4Dp8q1f1R6Wf3vEOlUb7Iwpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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