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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '139e24dea34f76a4aea6dcfcf92db30e6b0de3add70ab6b5ac72a345e2994f33' 
  AND token = '+JCzBSxvYxh21p8LaUl/B215fB50yxh9AOPfHndgvxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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