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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e519a4067f375cfd488ba1b67cf003c355abe892a31c6aca505e2045bfb4b777' 
  AND token = 'TwoQtnaqLSYjYMm6RtnFYvgZ/c/usXkYX9Ukm1oevK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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