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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eca2cc0d0562bc58b0699a2c9caa9d7d8624a3b853fabc3f2876254abcd1665' 
  AND token = '2Po0IsYYxvpr+/8zb22z79X/Je2K4fPJbH9UAJ15vuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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