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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17ec1c75ae2a5bbb5a8213af629d7dd61db30be33e93b0e975c8665ad23aa83b' 
  AND token = '7BeRlza6uitQHo++w+Ncaoy5FE3Q48QqFmfzOa4hNn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00210

JSON explain

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