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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8d2bfbfa07be558bb941e1005723a1bec08aecf84c8fb596a10467e16b3ac0e' 
  AND token = '4EVmBUSaSuk7PqQNIZIPdocBDLnK26lyuvpM9o1hTsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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