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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4fa2be49282c6dddc0a681ce2053739d6a17e7da834edf1c3aa82410d0a40dd' 
  AND token = 'dBSPYe6+F03mSzkdH07o5ud0D1/rN3oUmZil8CP2XWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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