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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6bcf5fcd3e98c81f28ee45f8183e236cbadcffe49e9b52066de8885004969c9' 
  AND token = '7ZTcHw2/CwcieitK1ePti5tKjRzFGQ377lAnBgJ+eyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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