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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '307de17e3c0050877381750065c48b04db9e363ce61211d461379fb152ee86c8' 
  AND token = 'WOnuCSKpt/AExkbKkpZJS0xkN07mDRM3pIs0SljTHEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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