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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09355e7949d23f628010bb5b8848538d0be503ff485780572c076192c7f7ca56' 
  AND token = 'WNV3Mp98a1G/0WR97vrtT5bUeJvqzE6WLLhVrJ6F8dM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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