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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe5d77c8e8aa61f1050833a401fa3e986303ad6ce985f05377677cb9622eeae5' 
  AND token = 'IdVfhfoYoGFJdnt+tqBoJieSO3euM2WSqh2xsu1BU5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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