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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '666f44de3ddb22bd9fcdffd48186603f62b3d2522a531de790264c40b19fbee3' 
  AND token = 'ea9bObgzO4Yk/WvXT/CB0izDP8j25SAzJdSF+8xJ/7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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