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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ec73adaf7b073a9c3660f5b0955d8172e1c7b26c5c322ee1bc3052ccd0ed281' 
  AND token = 'R8kpmFO/yFJb3v8s6oruWRvgaN0oObYOW4/mVLqBO88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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