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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8a15c93f12b5228e8dd4369677fcfc17b924590f7fbd190675aa1541f34a17d' 
  AND token = 'l5RZoZpxPmaCCvZg2n/+fqc4RwOlNFFfO/Fg35rLpa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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