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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8be1c5861dddd4296e9d9d57d99414eed8bfc68c23c9b1bad583fc26ab15ffed' 
  AND token = '4FEihnMcNkwQyakBI5fQu7Xq0j70lp/KRtleTYff45A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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