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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '047317e27812499ee7f1f62b063ffcb429cdb79ba04c9f7f9ec17f413e13cc92' 
  AND token = '+APZxjyy6OfBKwodP6Jb0hjpK2woHziLkDSKNbBGAHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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