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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a141ad234481e56b604f1c6c072c04dd15a9122ed08806c74bbc2857608cee19' 
  AND token = '8NtdpGyNHLcbIukCkMsFHCBSex85by4JcmV4X9jRHMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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