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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b2d934c96bf9229e97758678128dee18a94d0e234bb0b218b03fed92cd12700' 
  AND token = 'vbaTD/UIlOPIEbLmky9fMJzhECht3Bj5fvtIiKcK5xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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