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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3c3f36f114227006575ed432414beabf25b7cb58124432189685eebdad3969c' 
  AND token = 'dRuGZqw3tXx2huoTwBdcQ33kP43INvGlT3ds45SsmdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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