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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '971453729c9679532e26974c60c7c9dba4b9b0be753a8a4a4bf7032cbf541eb3' 
  AND token = 'tFmMfuRNwBegLPbzLLk1VOYvPIm8207TOq55OnDlIGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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