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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97c323d5feda63fdc621812916f419d7dca119834924a2566eccb3cce9f3917b' 
  AND token = 'vT/Kw2wi4b2OjhzbrxSp/qeOE757GMAauWbw0vlRNFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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