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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f521e52eabc01c8d61fb028ae1132b162f2619bdb25ba9a0af41390cb368fb9' 
  AND token = 'HoAAqRWHzjTVU84NI3ZA4CmjC9X+/I4V+sFHT/Lg+m4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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