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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93b657558ccaa3fcced4c218962f8f5f7135418f21ec34475d831c139e88ea86' 
  AND token = '1Z80KL8lQXuwu6S8FpLtQ/cX3bBei17czKheufRDWHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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