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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '059fe3c465a1597f5f8e665e4284cd94f8655cf373395ceae853379070b4405c' 
  AND token = 'enMn96l5sP7d5SzYFFUBL7Ap/LuyWiU82++0HEBChB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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