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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a66233349109bae8a520007183e08cb4036c315c86304eb56c248f3160cbc42' 
  AND token = '+8a5u5lJa5l7ExkoLZQg3k4AEFoZZ875uC2HS3L2g60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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