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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '792163fd5b17de607589d3fa918306a0d8938362667e15c96b194fef661df056' 
  AND token = 'zfPb2+8H31Dg5XFRAYxqzMAAFjNv0krZ3QreU6LGqzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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