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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ce97651ef8839ad84d959d50a4df6c8c58a0ab23e18c618b62fc562823087dc' 
  AND token = '7Pb+8DZP0cMmMhHo6LBSOhv7ckKs+8ybR6s/e7yyT4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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