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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c67dd27350de7a7babde834e948d82e42d50a925384e28bbacd08bac713d3c4' 
  AND token = 'Fb2SSwXQl/83J4PP5v+6Uu1Yv44jua/6mYmoL8lixGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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