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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad2bf166f7487d8d0679c8f2a834103b1f7700dce1ff3a2b12528b5eb607c33d' 
  AND token = 'FBWZ/keqW/2QUplfarRUrHQvHeyHCgMbKWWkyjVW8Dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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