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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8bcdea9c7f9b5cce650fee6d318be8f1861cbe25eb5ff30f0efd898ed475a5e' 
  AND token = 'eM5Cj3/ny9riHMdb/M6VzADI0qrVexn8ZF3vHDkFWW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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