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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '666b2dcf85f96d0f54ebd1740e2cbd7d9e25b17741e5391bf258b21b2ced2e02' 
  AND token = '1hFgpZFnxfla2gDmumOu2+hYLPOV3n/6XZYTeen+mmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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