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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dfcf940684e2e63a3a333ad7f829507d1c17ed40027aacd462122d3df6e2e7c' 
  AND token = '6tGZk6ig86lOc7wtCrIjdSpt0iySoESuwvrRDp0XDWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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