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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '618c92bd49f5ca6ef1d8aaed99d49136c512c6ff53c9a373319d8e5dbcbc4573' 
  AND token = 'Byx4Ee9E0q5v1uGI3yYZw4GO1EiNtWllqog1Innw+C8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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