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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b70e58fbd9dab608db19ef05ab6b8ca613971aea76c8b2fa9596ec6354f1ade1' 
  AND token = 'td35G0wnmvur8R2WULsOwGMAoBs2+wcyjMlLZdjJNJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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