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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a4f40adfafed15177cb688bc1adbb4c87b00158c8080936aa933cc74882d90d' 
  AND token = 'nR0LZNH15Yuh9N9o472GpnIg9haiEbBMioQw19aZc+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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