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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8c04c168884889e28ada785ddedd0869f8807b9d69172bff685f1d9436a20d4' 
  AND token = 'HAObiLX0D+kN3ewIyjENALMpgp0wzvVA2eiDlt2ZudI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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