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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9f0000b806befd1eb68a1ee63644f81ca58b725f66e3b9bc9123d949e491e38' 
  AND token = 'Q+JInMvIKzqdYl95qQfmCFH1nSuFdfxX/Xvlk+2GbQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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