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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edfb1983e6e9a2f80a20d9574c14dbd3983fed156fa534b937f7fe436f4ec0f3' 
  AND token = '13n+cWy+/3pZnEbP6QEuLKMmaFFajXoOjC0AvAlG6JM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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